Malicious PDF — malware analysis report

Static analysis result for SHA-256 4441aeac36ba3715…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 19:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7202101952985569345810573065b1c6 SHA-1: 8ecfec50e8a63ac5d9a3e696f7004dc2cc267334 SHA-256: 4441aeac36ba3715a40e2192e7001a37dbc4b100b17465edb7919ff1a6f2a3a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary attack pattern involves directing users to a collection of PDF files hosted across various domains, likely to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/mozopozizogapuwu.pdf In PDF document text
    • http://zjbfjt.com/upload/files/pomubadiwigigejugeratosu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161423c624fef8---53182919707.pdfIn PDF document text
    • https://ahha.az/userfiles/file/zupapunivez.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/26799731731.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/risulotabe.pdfIn PDF document text
    • http://onlinevay.com/upload/files/90282409142.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xegafusalijuvorabiziru.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/65740323192.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/67663728384.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zidegujobivew.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sagutamakij.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/kumiper.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/wodom.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/29626193241.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/78721553055.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f4bc1d5e2f8c010fd32dfc29264a83ff/56587894153.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/91106065431.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/mavexiberazivepu.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/gofovatukuwesubapig.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/75799336440.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/tijolonagamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apps+getting+uninstalled+automatically+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 11052 bytes
SHA-256: 683e163ac252b94a4ce99c0dd95f6ee9b83d8ac8c43a5d3ca3f3f0682168d7ae
font_02_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 17968 bytes
SHA-256: 14df42cfba00a0e59cf1cf8204c5711183804c3fc586b66587d1231e2571883a